thanks to the function of proxies I can finish this model in just half a day. The residential buildings and trees are all proxies. They are blocks in CAD drawings and components when input into sketchup. I just need to replace the content of each component by proxy. Very convenient!
some little regrets:
1. the color and reflection of the glasses are still not perfect and I want to know if there is a method to create the effect of glasses close to renderings.
2, if I use two point perspective in Sketchup and then move the rendering area, it won't synchronize in enscape window.
After all, thank you very much for such a useful software. The quality is far better than sketchup output while the efficiency is highly raised!